TW202305182A - A method of automatically compensating acid in a pickling process - Google Patents

Abstract

A method of automatically compensating acid in a pickling process, comprising an acid regeneration plant, an acid regeneration tank, a waste acid tank, and a plurality of acid circulation tanks connected to each other, wherein acid is transported from the acid regeneration tank to each of the acid circulation tanks with a regeneration acid compensation flow, and the acid is transported from at least one of the acid circulation tanks to another acid circulation tank with an acid circulation compensation flow. The method includes a step of: obtaining the regeneration acid compensation flow and the acid circulation compensation flow according to a product of a pickling surface area parameter, a thickness parameter of a pickling subject, a concentration parameter and a flow gradient parameter, so as to perform acid compensation.

Description

Method for automatic acid compensation in pickling process

The invention relates to a pickling process, in particular to a method for automatically compensating acid in the pickling process.

Hot rolling and subsequent cooling of the steel billet will produce scale, which needs to be pickled. The process includes passing the steel through multiple pickling tanks containing hydrochloric acid (increasing concentration one by one) to clean the surface scale. During the pickling process, the concentration of hydrochloric acid solution in each pickling tank will decrease accordingly, and each pickling tank needs to be supplemented with acid, which can be divided into automatic and manual control.

In terms of automatic acid supplementation, since it is impossible to check the internal program control design in detail, it is difficult to explore the real cause and program control modification for abnormal acid supplementation phenomena. Furthermore, there are too many and complicated parameters, and it is difficult to judge the level of influence of parameters and adjust the direction of improvement. Furthermore, the actual measurement value of the online acid concentration meter is deeply affected by impurities in the acid solution in the production line (for example: iron powder, dust, oil stains, foreign matter, etc. from hot-rolled steel coils). Value comparison, there are many errors in online measurement, which is also the main cause of abnormal acid supplementation. However, limited by the continuous production of the production line, shutting down for cleaning and calibration of the concentration meter will cause great disadvantages to the production rate.

It can be seen from the above that there is a need to improve the known methods of supplementing acid.

The main purpose of the present invention is to provide a method for automatically compensating acid in the pickling process, which can perform acid compensation simply and accurately.

In order to achieve the above-mentioned purpose, in one embodiment of the present invention, a kind of method for automatically compensating acid in pickling process is provided, wherein in this pickling process, comprise an acid solution regeneration plant, an acid solution regeneration tank, an A waste acid solution tank, and a plurality of acid solution circulation tanks connected to each other, wherein the acid solution regeneration plant is respectively connected to the acid solution regeneration tank and the waste acid solution tank, and the acid solution regeneration tank is respectively connected to the plurality of acid solution A liquid circulation tank, and at least one acid liquid circulation tank in the plurality of acid liquid circulation tanks is connected to the waste acid liquid tank, the acid liquid regeneration plant is used to produce an acid liquid, and the acid liquid is regenerated through the acid liquid The tanks are respectively input to the plurality of acid liquid circulation tanks, and the acid liquid used in the plurality of acid liquid circulation tanks is transported back to the acid liquid regeneration plant through the waste acid liquid tank, wherein the acid liquid is from The acid solution regeneration tank is sent to each of the acid solution circulation tanks, and each of the acid solution circulation tanks has a regeneration acid compensation flow rate, and the acid solution is from at least one of the acid solution circulation tanks The circulation tank is transported to another acid circulation tank with an acid circulation compensating flow rate, and the acid solution is transported from the acid circulation tank connected to the waste acid liquid tank to the waste acid liquid tank with a The waste acid flow rate, the method includes: according to the product of a pickling surface area parameter, a pickling target thickness parameter, a concentration parameter and a flow gradient parameter to obtain the compensation flow rate of the regeneration acid and the compensation flow rate of the acid cycle, so as to perform acid compensation , wherein the pickling surface area parameter is the value obtained by the product of the corresponding pickling speed and the width of a pickling mark, the thickness parameter of the pickling mark is the value obtained by the thickness of the pickling mark, and the concentration parameter is Simultaneously correspond to the actual acid concentration value of the single acid circulation tank and the value obtained from the set acid concentration value of the single acid circulation tank, and the flow gradient parameter is corresponding to the type of the pickling target A basic flow rate of the acid solution.

In one embodiment of the present invention, the plurality of acid circulation tanks include a first acid circulation tank, a second acid circulation tank and a third acid circulation tank, and the second acid circulation tank is connected to Between the first acid liquid circulation tank and the third acid liquid circulation tank, and the first acid liquid circulation tank is connected to the waste acid liquid tank; the acid liquid is transported from the third acid liquid circulation tank to the The second acid circulation tank has a first acid circulation compensation flow, the acid solution is transported from the second acid circulation tank to the first acid circulation tank with a second acid circulation compensation flow; The acid regeneration tank is sent to the third acid circulation tank with a first regeneration acid make-up flow, and the acid is sent from the acid regeneration tank to the second acid circulation tank with a second regeneration acid Compensation flow, wherein the compensation flow of the first regenerated acid, the compensation flow of the second regenerated acid, the first acid cycle make-up flow and the second acid cycle make-up flow.

In one embodiment of the present invention, the waste acid flow rate is 90% of the compensation flow rate of the second acid cycle.

In one embodiment of the present invention, when the liquid height of the acid liquid circulation tank connected to the waste acid liquid tank is lower than 50% to 60% of the total liquid height, the flow rate of the waste acid is 0.

In one embodiment of the present invention, when the pickling rate is lower than 20m ³ /hr, the pickling surface area parameter is fixed at 0.1.

In one embodiment of the present invention, when the liquid height of the acid liquid circulation tank is higher than 47% to 57% of the total liquid height, the flow system of the acid liquid from the total output of the acid liquid circulation tank is additionally increased 5m ³ /hr, and the total flow rate of the acid solution input from the acid solution circulation tank is additionally reduced by 2m ³ /hr.

In one embodiment of the present invention, when the first liquid height of the acid liquid circulation tank is lower than 40% to 50% of the total liquid height, the flow system of the acid liquid from the total input of the acid liquid circulation tank is additionally increased by 5m ³ /hr, and the total flow rate of the acid solution output from the acid solution circulation tank is additionally reduced by 2m ³ /hr.

In one embodiment of the present invention, the flow gradient parameters include the basic flow rate at which the acid liquid is transported from the acid liquid regeneration tank to each of the acid liquid circulation tanks and the acid liquid is transported from one acid liquid circulation tank to another A basic flow rate of the acid circulation tank.

In one embodiment of the present invention, the plurality of acid circulation tanks include a first acid circulation tank, a second acid circulation tank and a third acid circulation tank, and the second acid circulation tank is connected to Between the first acid liquid circulation tank and the third acid liquid circulation tank, and the first acid liquid circulation tank is connected to the waste acid liquid tank; the acid liquid is transported from the third acid liquid circulation tank to the The second acid liquid circulation tank defines a first basic flow rate, and the first basic flow rate system when the second acid liquid circulation tank is replenished with acid liquid through the acid liquid regeneration tank and the third acid liquid circulation tank at the same time It is different from the first basic flow rate when the second acid liquid circulation tank only replenishes acid liquid through the third acid liquid circulation tank.

In one embodiment of the present invention, the first basic flow rate of the second acid liquid circulation tank is smaller than the second acid liquid when the acid liquid is replenished through the acid liquid regeneration tank and the third acid liquid circulation tank at the same time The first basic flow rate when the circulation tank is supplemented with acid solution only through the third acid solution circulation tank.

The beneficial effect of the present invention is: according to the pickling area (estimated according to the pickling speed and the width of the pickling mark), the pickling mark (for example: steel) classification, the thickness of the pickling mark, the actual concentration of each tank and other parameters to automatically replenish acid Logical design, supplemented by a liquid level abnormality protection mechanism to obtain the lowest amount of acid replenishment in the production line. The method of automatic acid compensation in the pickling process of the present invention is easy to control and the parameters are simplified, and with its weight ratio, it is easy to judge the level of parameter influence, so as to adjust the improvement direction, and then remove the influence of the concentration error on the line to reduce the influence of acid concentration. drop to lowest. In addition, after improving the logic stability of automatic acid replenishment, the trouble of personnel having to change manual control is eliminated. As long as you grasp the calculation tool in advance and input the corresponding parameter value, you can know the corresponding amount of acid supplement in advance.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. In addition, in order to better illustrate the present invention, numerous specific details are given in the specific embodiments below. It will be understood by those skilled in the art that the present invention may be practiced without certain of the specific details.

Referring to Fig. 1, a method for automatically compensating acid in the pickling process according to an embodiment of the present invention, in the pickling process, includes an acid regeneration plant ARP, an acid regeneration tank RAT, a waste acid The liquid tank WAT, and a first acid circulation tank CT1 , a second acid circulation tank CT2 and a third acid circulation tank CT3 are interconnected.

As shown in Figure 1, the acid regeneration plant ARP is respectively connected to the acid regeneration tank RAT and the waste acid tank WAT, and the acid regeneration tank RAT is respectively connected to the first acid circulation tank CT1, the The second acid circulation tank CT2 and the third acid circulation tank CT3, the second acid circulation tank CT2 is connected between the first acid circulation tank CT1 and the third acid circulation tank CT3, and the third acid circulation tank CT3 An acid circulation tank CT1 is connected with the waste acid tank WAT.

The Acid Regeneration Plant ARP is used to produce an acid. Specifically, the acid recovery plant ARP processes the pickling waste liquid through a conventional acid recovery method, such as vacuum distillation, so as to recover the acid liquid. In this embodiment, the acid solution is hydrochloric acid solution. The acid solution is respectively input to the first acid solution circulation tank CT1, the second acid solution circulation tank CT2 and the third acid solution circulation tank CT3 through the acid solution regeneration tank RAT, and in the first acid solution circulation tank The acid liquid used in CT1, the second acid liquid circulation tank CT2 and the third acid liquid circulation tank CT3 is transported back to the acid liquid regeneration plant ARP through the waste acid liquid tank WAT.

The first acid circulation tank CT1 , the second acid circulation tank CT2 and the third acid circulation tank CT3 each have the acid solution from the acid regeneration plant ARP for cleaning a pickling target. In this embodiment, the pickling target is a steel strip, and the steel strip passes through a plurality of pickling tanks (namely: the first acid circulation tank CT1, the second acid circulation tank CT2 and the third acid circulation tank Circulation tank CT3) to be washed its surface rust. In this embodiment, the steel strip first passes through the first acid circulation tank CT1 for preliminary cleaning; then, the steel strip that has been initially washed is sent to the second acid circulation tank CT2 for main cleaning, that is, Most of the scale of the steel strip is cleaned in the second acid circulation tank CT2; finally, the steel strip is sent to the third acid circulation tank CT3 for final pickling, and completes this series of Pickling process. Corresponding to the order in which the steel strip passes through the acid circulation tank, the respective acid concentration of the first acid circulation tank CT1 , the second acid circulation tank CT2 and the third acid circulation tank CT3 increases one by one.

Referring to Figure 1, the acid liquid is transported from the acid liquid regeneration tank RAT to the third acid liquid circulation tank CT3 with a first regeneration acid compensation flow RASF3, and the acid liquid is transported from the acid liquid regeneration tank RAT to the third acid liquid circulation tank CT3. The second acid circulation tank CT2 has a second regeneration acid compensation flow RASF2; the acid solution is transported from the third acid circulation tank CT3 to the second acid circulation tank CT2 has a first acid circulation compensation flow A32F, The acid liquid is transported from the second acid liquid circulation tank CT2 to the first acid liquid circulation tank CT1 with a second acid circulation compensation flow A21F, and the acid liquid is transported from the first acid liquid circulation tank CT1 to the The waste acid tank WAT has a waste acid flow A1WF.

Continue to refer to Fig. 1, during cleaning this steel strip with this acid solution, the acid solution concentration in this first acid solution circulation tank CT1, this second acid solution circulation tank CT2 and this 3rd acid solution circulation tank CT3 will be Decrease, and acid supplementation is required to perform acid compensation to restore the desired acid concentration. In this embodiment, the acid regeneration tank RAT supplements acid solution to the second acid solution circulation tank CT2 and the third acid solution circulation tank CT3, and the third acid solution circulation tank CT3 also circulates the second acid solution The tank CT2 replenishes acid solution, and the second acid solution circulation tank CT2 supplies acid solution to the first acid solution circulation tank CT1 , and the first acid solution circulation tank CT1 discharges acid solution to the waste acid solution tank WAT. In other words, the third acid liquid circulation tank CT3 has acid liquid replenishment from the acid liquid regeneration tank RAT, and the total input amount of the acid liquid is the first regeneration acid compensation flow rate RASF3; the second acid liquid circulation tank CT2 With acid supplement from the acid regeneration tank RAT and the third acid circulation tank CT3, the total input volume of the acid is the second regenerated acid compensation flow RASF2 and the first acid circulation compensation flow A32F, and at the same time, The first acid circulation compensation flow A32F is also the total output flow of the acid solution of the third acid circulation tank CT3; the first acid circulation tank CT1 has acid supplement from the second acid circulation tank CT2, its acid The total input volume of the liquid is the second acid circulation compensation flow A21F, and at the same time, the second acid circulation compensation flow A21F is also the total output flow of the acid solution of the second acid circulation tank CT2; and the first acid circulation tank The flow A1WF of waste acid discharged by CT1 to the waste acid tank WAT is also the total output flow of the first acid circulation tank CT1. Certainly, the present invention is not limited thereto. In other embodiments, the acid supplement of the first acid circulation tank CT1 may also include the acid regeneration tank RAT; or the acid supplement of the second acid circulation tank CT2 may only come from the third acid Liquid circulation tank CT3, it depends on the actual application conditions.

As can be seen from the above, the focus of supplementing the acid solution, that is, compensating the acid solution, is the flow rate between the tanks. The method for automatically compensating acid in the pickling process of the present invention is to set the flow rate. The method includes: The product of a pickling surface area parameter, a pickling target thickness parameter, a concentration parameter and a flow gradient parameter is used to obtain the regeneration acid compensation flow and the acid circulation compensation flow for acid compensation.

The pickling surface area parameter is the value corresponding to the product of a pickling speed and the width of a pickling target. The larger the area of the pickling target, the more acid solution is needed, and the more acid compensation is required. many. The thickness parameter of the pickling target is the value obtained corresponding to the thickness of the pickling target. The thicker the pickling target is, the thicker the rust scale is, the more acid solution is required, and the more acid compensation amount is required. many. The concentration parameter is a value corresponding to the actual acid concentration value of the single acid circulation tank and the set acid concentration value of the single acid circulation tank at the same time, which is for the first acid circulation tank CT1, The actual measured acid concentration of the second acid circulation tank CT2 and the third acid circulation tank CT3 is compensated for not reaching or exceeding the preset acid concentration, so as to stabilize the concentration of each tank. The flow gradient parameter is a basic flow rate of the acid solution corresponding to the type of pickling target. Different types of pickling targets require different pickling volumes, and different types of pickling targets need to be set and compensated. To sum up, the formulas of each flow setting are shown in Table 1 below.

Table 1] flow setting = Pickling Surface Area Parameters * Flow Gradient Parameters * Pickling standard thickness parameters * Concentration parameter RASF2 = PACs * AR2 * TC * AC (CT2) RASF3 = PACs * AR3 * TC * AC (CT3) A32F = PACs * A32 * TC * AC (CT2) A21F = PACs * A21 * TC * AC (CT1) A1WF = 0 When the CT1 fluid level is below 50% to 60% of the total fluid level A1WF = A21F * 90% When the CT1 fluid level is 50% to 60% above the total fluid level

What needs to be specially explained is the concentration parameter. For example, in the calculation of RASF2, that is, the compensation flow rate of the second regeneration acid, the concentration parameter is the actual value corresponding to the second acid circulation tank CT2 (indicated by (CT2) in the table). The acid concentration value and the value obtained by the preset acid concentration value; and so on, in A21F, that is, in the calculation of the compensation flow rate of the second acid circulation, its concentration parameter is corresponding to the first acid circulation tank CT1 (indicated by (CT1) in the table) the actual acid concentration value and the value obtained by the preset acid concentration value. In addition, the setting of A1WF, that is, the flow rate of the waste acid depends on the liquid level of the first acid liquid circulation tank CT1. In this embodiment, when the liquid level of the first acid liquid circulation tank CT1 is lower than 50% to 60% of the total liquid height, preferably 55%, it means that the acid in the first acid liquid circulation tank CT1 If the amount is too small, in this case, no acid liquid is discharged to the waste acid liquid tank, and the flow rate is set to 0. When the liquid level of the first acid liquid circulation tank CT1 is higher than 50% to 60% of the total liquid height, preferably 55%, it means that the acid amount of the first acid liquid circulation tank CT1 is too much, and it is expected that the acid liquid The flow rate from the second acid liquid circulation tank CT2 to the first acid liquid circulation tank CT1 is close to the flow rate of the acid liquid from the first acid liquid circulation tank CT1 to the waste acid liquid tank, accordingly, the The waste acid flow rate is set to be 90% of the compensation flow rate of the second acid cycle. It is worth noting that in practical applications, in order to reserve the operation buffer time of the flow setting, the liquid level of the first acid circulation tank CT1 will be lower/higher than the total liquid height, for example, 55% minus 2% , that is, 53%, the above-mentioned flow setting is carried out.

The following describes each parameter:

Table [2]: Pickling Surface Area Parameter (PAC) code name illustrate P.S. Pickling Speed (Pickle Speed) (mpm) WID Strip width (Width) (mm) PACs PS*WID 0 => 0 < 42500 => 0.5 < 140000 => 0.8 < 195000 => 1 < 235000 => 1.2 < 255000 => 1.4 < 999999 => 1.8

Refer to Table [2] at the same time, as mentioned above, the pickling surface area parameter is the value obtained by the product of the corresponding pickling speed (PS) and the width (WID) of the pickling target (steel strip). For example, when PS times (*) WID is equal to 0, then PAC is 0; when PS*WID is less than 42500, then PAC is 0.5; when PS*WID is greater than or equal to 42500 and less than 140000, then PAC is 0.8, and so on .

Table [3] Thickness parameter (TC) of pickling standard when TC Strip thickness T (mm) 0 => 0 < 3.49 => 1.2 < 9.9 => 1.8

Referring to Table [3], when the steel strip thickness is 0, TC is 0; when the steel strip thickness is less than 3.49, then TC is 1.2; when the steel strip thickness is greater than or equal to 3.49 and less than 9.9, then TC is 1.8.

Table [4] Concentration parameters (AC) PV Actual measured value of acid circulation tank SV Acid circulation tank setpoint when AC PV 0 SV => 1.05 < 95%SV SV => 1.05 < 103%SV SV => 1.00 < 200%SV SV => 0.95

Refer to Table [4] at the same time. As mentioned above, the concentration parameter is the actual acid concentration value (PV) corresponding to a single acid circulation tank and the set acid concentration value (SV) of a single acid circulation tank. ) the resulting value. In other words, the AC parameter is obtained based on a specific acid circulation tank, such as the relationship between the actual concentration value of the first acid circulation tank and its preset concentration value. When PV=0, then AC is 1.5; when PV is less than 95% of SV, then AC is 1.05; when PV is greater than or equal to 95% and less than 103% of SV, then AC is 1; when PV is greater than or equal to When the SV is 103% and less than 200%, the AC is 0.95.

Table [5] Flow gradient parameter description 1 acid flow code name illustrate RAT->CT3 AR3 Base output setting for acid supply from RAT to CT3 RAT->CT2 AR2 Base output setting for acid supply from RAT to CT2 CT3->CT2 A32 Basic output setting of acid supply from CT3 to CT2 CT2->CT1 A21 Basic output setting for acid supply from CT2 to CT1 CT1->WAT A1W Basic output setting for acid discharge from CT1 to WAT

Table [6] Flow gradient parameter description 2 Unit: m ³ /hr PC ARA Rear A32 A21 AR2 AR3 Original A32 General Mild Steel 1 5 2.5 3.4 1.5 3.5 4 Thin mild steel, low carbon steel 2 5 2.5 3.4 1.5 3.5 4 Thick mild steel, very low carbon steel 3 5.8 3.5 3.5 1.7 4.1 5.2 Medium mild steel, very low carbon steel 4 5 2.9 3.3 1.5 3.5 4.4 High boron hard-to-wash steel, automotive sheet 5 6 3.7 3.7 1.8 4.2 5.5 Special Steel 6 3.5 2.2 2.5 1.1 2.5 3.2 General electrical, special sheet 7 3.3 2.8 1.5 0 3.3 2.8 high strength steel 8 3.8 2.3 2.9 1.1 2.7 3.4 Long-term storage thick high-strength steel 9 6.5 4.1 4 2 4.6 6 bright panel 10 3.5 2.0 1.5 1.1 2.5 3 pre-annealed electrical 11 3.3 2.8 1.5 0 3.3 2.8

Referring to Table [5], the flow gradient parameters include the basic flow rate at which the acid liquid is transported from the acid liquid regeneration tank to each of the acid liquid circulation tanks, and the acid liquid is transported from one acid liquid circulation tank to another of the acid liquid circulation tanks. The base flow rate of the acid circulation tank. As mentioned above, the flow gradient parameter is based on the type of pickling target. Referring to Table [6], taking general mild steel as an example, its A21 is 3.4, AR2 is 1.5, and AR3 is 3.5. It is worth noting that A32 includes the original A32 and the post-A32. If the acid supplement of the second acid circulation tank CT2 only comes from the third acid circulation tank CT3, the original A32 is used; if the acid supplement of the second acid circulation tank CT2 does not come from the third acid circulation Tank CT3, which also comes from the acid regeneration tank RAT, uses rear A32 to avoid supplementing too much acid. ARA is the total amount of acid solution output by the acid solution regeneration tank RAT. In this embodiment, the acid solution regeneration tank RAT only outputs acid solution to the second acid solution circulation tank CT2 and the third acid solution circulation tank CT3, So ARA=AR2+AR3.

The flow setting method and its related parameters have been described in detail above, and the following table 7 shows how to further adjust the flow setting in special situations.

Table [7] Special specifications item illustrate 1 When the pickling speed is lower than 20mpm, PAC is fixed as 0.1 2 When the CT liquid level is higher than a certain height, the total output flow setting will increase 5 Total input flow setting minus 2 m ³ /hr Stop until 30 seconds after the warning disappears 3 When the CT liquid level is lower than a certain height, the total input flow setting will increase 5 Total output flow setting minus 2 m ³ /hr Stop until 30 seconds after the warning disappears

Referring to Table [7], when the pickling speed is lower than 20mpm, the pickling surface area parameter (PAC) is fixed at 0.1. When the liquid height of the acid liquid circulation tank is higher than 47% to 57% of the total liquid height, preferably 52%, the flow rate of the acid liquid output from the acid liquid circulation tank is additionally increased by 5m ³ / hr, and the flow rate of the acid solution input from the acid solution circulation tank is additionally reduced by 2m ³ /hr. When the first liquid height of the acid liquid circulation tank is lower than 40% to 50% of the total liquid height, preferably 45%, the flow rate of the acid liquid imported from the acid liquid circulation tank is additionally increased by 5m ³ /hr , and the flow rate of the acid solution output from the acid solution circulation tank is additionally reduced by 2m ³ /hr. For example, when the first liquid height of the second acid liquid circulation tank is lower than 45% of the first total liquid height, the compensation flow rate of the second regeneration acid and the compensation flow rate of the first acid cycle (that is, the total input flow rate) are proportionally increased by 5m ³ / hr, for example, the compensation flow of the second regeneration acid increases by 2m ³ /hr, while the compensation flow of the first acid cycle increases by 3m ³ /hr; and the compensation flow of the second acid cycle (ie, the total output flow) decreases by 2m ³ /hr.

As shown in Figure 2, it is the interface of the calculation tool using the method of automatic acid compensation in the pickling process of the present invention. After inputting each parameter into the box, each flow rate of the dotted line box on the lower left can be obtained in advance, that is, Acid supplementation.

Fig. 3 shows the consumption trend of regenerated acid units by using or not using the method of automatically compensating acid in the pickling process of the present invention. From the comparison of comparative examples and embodiments (using the method of the present invention), it can be It is seen that the unit consumption of regenerated acid is significantly reduced by using the method of automatic acid compensation in the pickling process of the present invention.

In summary, the beneficial effect of the method for automatically compensating acid in the pickling process of the present invention lies in: classification according to the pickling area (estimated according to the pickling speed and the width of the pickling target), the pickling target (for example: steel) , Pickling standard thickness, the actual concentration of each tank and other parameters for automatic acid replenishment logic design, supplemented by a liquid level abnormality protection mechanism to obtain the minimum amount of acid replenishment for the production line. The method for automatically compensating acid in the pickling process of the present invention is easy to control, with simple parameters, and with its weight ratio, it is easy to judge the level of parameter influence, so as to adjust the direction of improvement, and then remove the influence of the actual concentration error on the line to reduce the influence of acid concentration. drop to lowest. In addition, after improving the logic stability of automatic acid replenishment, the trouble of changing manual control is eliminated. Only by inputting the corresponding parameter value through the calculation tool in advance, you can know the corresponding amount of acid supplement in advance.

Although the present invention has been disclosed with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in this art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the attached patent application.

ARP: Acid Regeneration Plant A1WF: Waste Acid Flow A21F: second acid cycle compensation flow A32F: 1st Acid Cycle Compensation Flow CT1: The first acid circulation tank CT2: Second acid circulation tank CT3: The third acid circulation tank RAT: acid regeneration tank RASF2: second regeneration acid compensation flow RASF3: first regenerated acid compensation flow WAT: waste acid tank

Figure 1 is a block diagram of various devices in a method for automatically compensating acid in a pickling process according to an embodiment of the present invention; FIG. 2 is an interface of a computing tool using the method for automatically compensating acid in a pickling process according to an embodiment of the present invention; and Fig. 3 is a comparison of consumption trends of regenerated acid unit under the use or non-use of the method of automatic acid compensation in the pickling process of the present invention.

Claims (10)

A method for automatically compensating acid in a pickling process, wherein in the pickling process, it includes an acid solution regeneration plant, an acid solution regeneration tank, a waste acid solution tank, and a plurality of acid solution circulation tanks connected to each other, Wherein the acid solution regeneration plant is respectively connected to the acid solution regeneration tank and the waste acid solution tank, and the acid solution regeneration tank is respectively connected to the plurality of acid solution circulation tanks, and at least one of the plurality of acid solution circulation tanks The acid liquid circulation tank is connected to the waste acid liquid tank. The acid liquid regeneration plant is used to produce an acid liquid. The acid liquid is respectively input to the plurality of acid liquid circulation tanks through the acid liquid regeneration tank, and in the The acid liquid used in the plurality of acid liquid circulation tanks is transported back to the acid liquid regeneration plant through the waste acid liquid tank, wherein the acid liquid is transported from the acid liquid regeneration tank to each of the acid liquid circulation tanks, Each of the acid circulation tanks has a regenerating acid compensation flow rate corresponding to each of the acid circulation tanks, and the acid solution is transported from at least one of the acid circulation tanks to another acid circulation tank, and has a Acid circulation compensation flow, and the acid liquid is transported from the acid liquid circulation tank connected to the spent acid liquid tank to the spent acid liquid tank, and has a waste acid flow rate, the method includes: according to a pickling surface area parameter, a The thickness parameter of the pickling target, the product of a concentration parameter and a flow gradient parameter are used to obtain the compensation flow rate of the regenerated acid and the compensation flow rate of the acid cycle for acid compensation, wherein the pickling surface area parameter corresponds to a pickling speed and an acid The value obtained by the product of the width of the pickling mark, the thickness parameter of the pickling mark is the value obtained corresponding to the thickness of the pickling mark, and the concentration parameter is the actual acid concentration value corresponding to a single acid circulation tank and a single The value obtained from the set acid concentration value of the acid liquid circulation tank and the flow gradient parameter are a basic flow rate of the acid liquid corresponding to the type of the pickling target. The method as described in claim 1, wherein the plurality of acid circulation tanks include a first acid circulation tank, a second acid circulation tank and a third acid circulation tank, and the second acid circulation tank is connected to Between the first acid liquid circulation tank and the third acid liquid circulation tank, and the first acid liquid circulation tank is connected to the waste acid liquid tank; the acid liquid is transported from the third acid liquid circulation tank to The second acid circulation tank has a first acid circulation compensation flow, the acid solution is transported from the second acid circulation tank to the first acid circulation tank with a second acid circulation compensation flow; and the acid solution is sent from the acid regeneration tank to the third acid circulation tank with a first regeneration acid make-up flow, and the acid is sent from the acid regeneration tank to the second acid circulation tank with a second regeneration Acid compensation flow rate, wherein the first regeneration acid compensation flow rate, the second regeneration acid compensation flow rate, the first The acid cycle make-up flow and the second acid cycle make-up flow. The method as described in claim 2, wherein when the liquid height of the acid liquid circulation tank connected to the waste acid liquid tank is higher than 50% to 60% of a total liquid height, the waste acid flow rate is the second acid 90% of the loop compensation flow. The method according to claim 1, wherein when the first liquid height of the acid liquid circulation tank connected to the waste acid liquid tank is lower than 50% to 60% of a total liquid height, the flow rate of the waste acid is 0. The method according to claim 1, wherein when the pickling rate is lower than 20m ³ /hr, the pickling surface area parameter is fixed at 0.1. The method as described in claim item 1, wherein when the first liquid height of the acid liquid circulation tank is higher than 47% to 57% of a total liquid height, the flow rate of the acid liquid from the total output of the acid liquid circulation tank is additional 5m ³ /hr is increased, and the total input flow rate of the acid solution from the acid solution circulation tank is additionally reduced by 2m ³ /hr. The method as described in claim item 1, wherein when the first liquid height of the acid liquid circulation tank is lower than 40% to 50% of a total liquid height, the flow system of the acid liquid from the total input of the acid liquid circulation tank is additionally increased 5m ³ /hr, and the total output flow of the acid solution from the acid circulation tank is additionally reduced by 2m ³ /hr. The method as described in claim 1, wherein the flow gradient parameters include the basic flow rate at which the acid liquid is transported from the acid liquid regeneration tank to each of the acid liquid circulation tanks and the acid liquid is transported from one of the acid liquid circulation tanks to Another base flow of the acid circulation tank. The method as described in claim 8, wherein the plurality of acid circulation tanks include a first acid circulation tank, a second acid circulation tank and a third acid circulation tank, and the second acid circulation tank is connected to between the first acid circulation tank and the third acid circulation tank, and the first acid circulation tank is connected to the waste acid circulation tank; the acid is transported from the third acid circulation tank to The second acid circulation tank defines a first basic flow rate, the first basic flow rate when the second acid circulation tank is supplemented with acid solution through the acid regeneration tank and the third acid circulation tank at the same time It is different from the first basic flow rate when the second acid liquid circulation tank only replenishes acid liquid through the third acid liquid circulation tank. The method as described in claim item 9, wherein the first basic flow rate of the second acid liquid circulation tank is less than the second acid liquid when the acid liquid is replenished through the acid liquid regeneration tank and the third acid liquid circulation tank at the same time The first basic flow rate under the condition that the liquid circulation tank is supplemented with acid liquid only through the third acid liquid circulation tank.

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